Wis. Stat. § 814.02
A stipulation in a note or mortgage to pay certain attorney's fees other than taxable costs will be enforced when the amount stipulated to be paid is reasonable. Lakeshore Commercial Finance Corp. v. Bradford Arms Corp., 45 Wis. 2d 313, 173 N.W.2d 165 (1970). Neither this section or s. 814.036 grants the trial court the power to allow costs that are not explicitly authorized by statute. Kleinke v. Farmers Coop. Supply & Shipping, 202 Wis. 2d 138, 549 N.W.2d 714 (1996), 95-0856. The court exercises its discretion under this section by determining what is a necessary cost. Aspen Services, Inc. v. IT Corp., 220 Wis. 2d 491, 583 N.W.2d 849 (Ct. App. 1998), 97-0897. Kleinke instructs that the trial court's discretion is limited to when the court may allow costs and not what costs are allowed. The trial court erred in awarding costs for the transcription of materials on a computer disk that were made for the convenience of the moving party. Transcripts obtained solely for the convenience of counsel are not necessary disbursements under sub. (2) and thus not taxable costs. Alswager v. Roundy's Inc., 2005 WI App 3, 278 Wis. 2d 598, 692 N.W.2d 333, 03-2274.